Specification Product Name: Optical Trial Lens Frame Adjustment range of interpupillary distance: the interpupillary distance range of both eyes is 48 80mm the left and right interpupillary distances are each 24 40mm the minimum scale value is 1mm The axis scale of the indexing plate: 0-180 Frame effective inner aperture: f 35.4mm The number of lenses that can be inserted into the left and right frames: 4 (2 front and 2 rear) Rotation degree of the optical axis of the lens in the inner circle of the frame: 110 The non-parallelism between the optical axis of the lens and the geometric axis of the frame: 2.5 The misalignment between the optical center and the geometric center of the lens: 0.5mm The displacement of the lens relative to the geometric center of the frame: 0.3mm Adjustment range of nose pads: Adjustable length: 0 26mm Angle: any angle The adjustable length range of left and right temple feet: 0 30mm Weight 44g Packing volume: 200 120 65mm Weight (including packaging): 220g Package 1x Trial Frame Notice Regarding color: Product pictures are photographed in real objects, but due to light display and other reasons, there may be a little color difference, please understand Regarding size: The product size is artificially measured, and there be an error of 1-2cm, please understand?Multi-Adjustment Knobs?The prescription glasses frame contains multiple knobs to adjust the interpupillary distance, nose pads, temples, etc. All of our products have been strictly screened with high quality to ensure customers have a good experience. ?Adjustable Optical Optic Trial Lens Frame?The anterograde angle of the test frame can be adjusted according to the different face shapes of customers, and the length of the temples can be adjusted, the scale is accurate and the calculation is convenient. ?Ultralight Trial Frame?50g ophthalmic titanium can insert 4 lenses at the same time, 2 lenses in the front and 2 lenses in the back improve the convenience of optometry and not much weight when using. ?Adjustable Pupil Height?Through the pupil height adjustment knob on the test frame, it can be adjusted according to the pupil needs of different subjects. ?Adjustable Interpupillary Distance?Eye Optometry Trial Lens Frame The adjustable range of interpupillary distance of both eyes is 48 80 mm, the left and right interpupillary distance is 24 40 mm, the maximum scale is 1 mm and the adjustable range of single eye is 24 40 mm.